The sense of pride expressed by officials of the Obama administration at the release of Army Sgt. Bowe Bergdahl is not shared by many of those who served with him: veterans and soldiers who call him a deserter whose "selfish act" ended up costing the lives of better men.

"I was pissed off then, and I am even more so now with everything going on," said former Sgt. Matt Vierkant, a member of Bergdahl's platoon when he went missing on June 30, 2009. "Bowe Bergdahl deserted during a time of war, and his fellow Americans lost their lives searching for him."

Vierkant said Bergdahl needs to not only acknowledge his actions publicly but face a military trial for desertion under the Uniform Code of Military Justice.

A reporter asked Defense Secretary Chuck Hagel on Sunday whether Bergdahl had left his post without permission or deserted -- and, if so, whether he would be punished. Hagel didn't answer directly. "Our first priority is assuring his well-being and his health and getting him reunited with his family," he said. "Other circumstances that may develop and questions, those will be dealt with later."

Kim Dong Chul, a South Korean-born American citizen detained in North Korea, is escorted to his trial April 29 in Pyongyang. A North Korean court sentenced Kim to 10 years in prison for what it called acts of subversion and espionage. North Korea watchers interpret the detainment of Americans and other foreign citizens as a collection of bargaining chips by the reclusive regime.

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Photos:Americans detained abroad

University of Virginia student Otto Frederick Warmbier was detained by North Korea after being accused of carrying out "a hostile act" against the government, state media reported. In March, he was sentenced to 15 years of hard labor for allegedly removing a political banner from a Pyongyang hotel.

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Photos:Americans detained abroad

Jason Rezaian, The Washington Post's bureau chief in Tehran, was released January 16 as part of a prisoner swap. Rezaian was convicted by an Iranian Revolutionary Court in October, according to Iran's state-run media. Rezaian was reportedly facing up to 20 years, but the sentence was not specified. The journalist was taken into custody in July 2014 and later charged with espionage; the Post has denied all allegations against him. His wife, Yeganeh Salehi, also was detained in July 2014 but later released.

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Saeed Abedini, a U.S. citizen of Iranian birth, was freed as part of a prisoner swap that included Washington Post journalist Jason Rezaian on January 16. Abedini was sentenced to eight years in prison in January 2013. He was accused of attempting to undermine the Iranian government and endangering national security by establishing home churches. He was detained in Iran on September 26, 2012, according to the American Center for Law and Justice.

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Amir Hekmati, a former U.S. Marine charged with spying, was freed as part of a prisoner swap that included Washington Post journalist Jason Rezaian on January 16. An Iranian court threw out a 2011 death sentence forHekmati, but he was secretly retried in Iran and convicted of "practical collaboration with the U.S. government," his sister told CNN on April 11. He was sentenced to 10 years in prison, she said. Hekmati was detained in August 2011 during a visit to see his grandmother. His family and the Obama administration deny accusations he was spying for the CIA.

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Photos:Americans detained abroad

Siamak Namazi, a Dubai-based businessman with dual U.S. and Iranian citizenship, was detained while visiting relatives in Tehran, the Wall Street Journal reported October 29, citing unnamed sources. The Washington Post also reported his detention, citing a family friend who spoke on condition of anonymity. The Post reported that it wasn't clear what Namazi is alleged to have done. His detention would bring to five the number of Americans detained or unaccounted for in the Islamic republic.

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Scott Darden was taken hostage by Houthi rebels in Yemen in March 2015. He was captured while working for New Orleans-based Transoceanic Development, according to a source close to his family.

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Retired FBI agent Robert Levinson has been missing since 2007. His family says he was working as a private investigator in Iran when he disappeared, and multiple reports suggest Levinson may have been working for the CIA. His family told CNN that they have long known that Levinson worked for the CIA, and they said it's time for the government to lay out the facts about Levinson's case. U.S. officials have consistently denied publicly that Levinson was working for the government, but they have repeatedly insisted that finding him and bringing him home is a "top" priority. The FBI increased its reward for information on Levinson from $1 million to $5 million.

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Mothers Linda Boyle, left, and Lyn Coleman hold photo of their married children, Joshua Boyle and Caitlin Coleman, who were kidnapped by the Taliban in late 2012. Coleman was pregnant when she was kidnapped and is believed to have had a child in captivity.

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Jailed since 2013 and sentenced to life for supporting the Muslim Brotherhood in Egypt, Mohamed Soltan was eventually released, the U.S. Embassy in Cairo said in May 2015. Soltan's family denies he belonged to the Brotherhood. Soltan had been a dual U.S. and Egyptian citizen, but he renounced his Egyptian citizenship as a condition of his release.

One of three Americans detained in North Korea, Jeffrey Edward Fowle was released and sent home, a State Department official told CNN in October 2014. Fowle was accused of leaving a Bible in a hotel where he was staying. North Korea announced Fowle's detention in June of that year, saying he had violated the law by acting "contrary to the purpose of tourism." Fowle told CNN: "I've admitted my guilt to the government and signed a statement to that effect and requested forgiveness from the people and the government of the DPRK."

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In May 2013, a North Korean court sentenced Kenneth Bae, a U.S. citizen, to 15 years of hard labor for committing "hostile acts" against the state. North Korea claimed Bae was part of a Christian plot to overthrow the regime. In a short interview with CNN in September 2014, Bae said he is working eight hours a day, six days a week at a labor camp. "Right now what I can say to my friends and family is, continue to pray for me," he said. After months in detention, he and fellow American detainee Matthew Todd Miller were released in November.

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Miller, an American sentenced to six years of hard labor in North Korea, was one of three Americans who spoke to CNN's Will Ripley in September 2014 and implored the U.S. government for help. The 24-year-old was accused of tearing up his tourist visa and seeking asylum upon entry to North Korea.

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American journalist Peter Theo Curtis was handed over to U.N. peacekeepers in August 2014 after nearly two years in captivity. He is believed to have been captured in October 2012 and held by the al-Nusra Front, a Syrian rebel group with ties to al Qaeda.

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Alan Gross, at right with Rabbi Arthur Schneier, was jailed while working as a subcontractor in Cuba in December 2009. Cuban authorities say Gross tried to set up illegal Internet connections on the island. Gross says he was just trying to help connect the Jewish community to the Internet. Former President Jimmy Carter and New Mexico Gov. Bill Richardson both traveled to Cuba on Gross' behalf. He was eventually released in December.

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This undated image provided by the U.S. Army shows Sgt. Bowe Bergdahl, who had been held by insurgents in Afghanistan since 2009. The White House announced Bergdahl's release on May 31, 2014. Bergdahl was released in exchange for five senior Taliban members held by the U.S. military. In March 2015, the U.S. military charged Bergdahl with one count each of "Desertion with Intent to Shirk Important or Hazardous Duty," and "Misbehavior Before The Enemy by Endangering the Safety of a Command, Unit or Place."

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U.S. tourist and Korean War veteran Merrill Newman arrives at the Beijing airport on December 7, 2013, after being released by North Korea. Newman was detained in October 2013 by North Korean authorities just minutes before he was to depart the country after visiting through an organized tour. His son Jeff Newman said the Palo Alto, California, man had all the proper paperwork and set up his trip through a North Korean-approved travel agency.

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Y – Mexican authorities arrested Yanira Maldonado, a U.S. citizen, right, in May 2013, for alleged drug possession. She and her husband, Gary, were traveling from Mexico back to the United States when their bus was stopped and searched. She was released a few days later and is now back in the United States.

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North Korea has arrested Americans before, only to release them after a visit by a prominent dignitary. Journalists Laura Ling, center, and Euna Lee, to her left, spent 140 days in captivity after being charged with illegal entry to conduct a smear campaign. They were freed in 2009 after a trip by former President Bill Clinton.

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Former President Jimmy Carter negotiated the release of Aijalon Gomes, who was detained in 2010 after crossing into North Korea illegally from China. Analysts say high-level visits give Pyongyang a propaganda boost and a way to save face when it releases a prisoner.

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Detained in April 2011, Eddie Yong Su Junwas released by North Korea a month afterward. His alleged crime was not provided to the media. The American delegation that secured his freedom included Robert King, the U.S. special envoy for North Korean human rights issues.

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Without any apparent U.S. intervention, Robert Park was released by North Korea in 2010. The Christian missionary crossed into North Korea from China, carrying a letter asking Kim Jong Il to free political prisoners and resign. North Korea's state-run news agency said Park was released after an "admission and sincere repentance of his wrongdoings." Here, Park holds a photo of Kim and a malnourished child during a protest in Seoul.

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Josh Fattal, center; Sarah Shourd, left; and Shane Bauer were detained by Iran while hiking near the Iraq-Iran border in July 2009. Iran charged them with illegal entry and espionage. Shourd was released on bail for medical reasons in September 2010; she never returned to face her charges. Bauer and Fattal were convicted in August 2011, but the next month they were released on bail and had their sentences commuted.

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Haleh Esfandiari, an Iranian-American scholar, was detained at Iran's Evin Prison, spending months in solitary confinement before Iran released her on bail in August 2007. Esfandiari was visiting her ailing mother in Tehran when she was arrested and charged with harming Iran's national security.

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Sixteen Americans were among the dozens arrested in December 2011 when Egypt raided the offices of 10 nongovernmental organizations that it said received illegal foreign financing and were operating without a public license. Many of the employees posted bail and left the country after a travel ban was lifted a few months later. Robert Becker, right, chose to stay and stand trial. He spent two years in prison and has since returned to the United States.

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Filmmaker Timothy Tracy was arrested in Venezuela in April 2013 on allegations of funding opponents of newly elected President Nicolas Maduro, successor to the late Hugo Chavez. Tracy went to Venezuela to make a documentary about the political division gripping the country. He was released in June 2013.

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Photos:Photos: Released Guantanamo Taliban detainees arrive in Qatar

Photos:Photos: Released Guantanamo Taliban detainees arrive in Qatar

Released detainees arrive in Qatar – CNN has obtained photos from the purported Twitter account of Taliban spokesman Zabihullah Mujahid. The photos purportedly show the arrival of the Guantanamo detainees arriving in Doha, Qatar, after being released in exchange for U.S. Army Sgt. Bowe Bergdahl. This image allegedly shows Mullah Norullah Noori.

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Photos:Photos: Released Guantanamo Taliban detainees arrive in Qatar

Released detainees arrive in Qatar – The Twitter account says that this photo is of Khair Ulla Said Wali Khairkhwa.

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Photos:Photos: Released Guantanamo Taliban detainees arrive in Qatar

Released detainees arrive in Qatar – According to the Twitter account, this is Mullah Mohammad Fazl arriving in Qatar.

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Released detainees arrive in Qatar – Mullah Norullah Noori and Abdul Haq Wasiq can be seen in this photo, according to the Twitter account.

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Photos:Guantanamo detainees swapped for Bergdahl

Photos:Guantanamo detainees swapped for Bergdahl

Five detainees at Guantanamo Bay were transferred to Qatar in exchange for the release of Army Sgt. Bowe Bergdahl, who was being held by the Taliban. Two senior administration officials confirmed the names of the released detainees, whose photos were obtained by WikiLeaks. Khair Ulla Said Wali Khairkhwa, seen here, was an early member of the Taliban in 1994 and was interior minister during the Taliban's rule. He was arrested in Pakistan and was transferred to Guantanamo in May 2002. During questioning, Khairkhwa denied all knowledge of extremist activities.

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Photos:Guantanamo detainees swapped for Bergdahl

Mullah Mohammad Fazl commanded the main force fighting the U.S.-backed Northern Alliance in 2001, and served as chief of army staff under the Taliban regime. Fazl was detained after surrendering to Abdul Rashid Dostam, the leader of Afghanistan's Uzbek community, in November 2001. He was transferred into U.S. custody in December 2001 and was one of the first arrivals at Guantanamo, where he was assessed as having high intelligence value.

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Photos:Guantanamo detainees swapped for Bergdahl

Mullah Norullah Noori served as governor of Balkh province in the Taliban regime and played some role in coordinating the fight against the Northern Alliance. Like Fazl, Noori was detained after surrendering to Dostam, the Uzbek leader, in 2001.

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Abdul Haq Wasiq was the deputy chief of the Taliban regime's intelligence service. Wasiq claimed, according to an administrative review, that he was arrested while trying to help the United States locate senior Taliban figures. He denied any links to militant groups.

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Photos:Guantanamo detainees swapped for Bergdahl

Mohammad Nabi Omari was a minor Taliban official in Khost Province and was the Taliban's chief of communications and helped al Qaeda members escape from Afghanistan to Pakistan. He also said that he had worked with a U.S. operative named Mark to try to track down Taliban leader Mullah Omar.

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Following his release from five years of captivity in Afghanistan on Saturday, Bergdahl was transferred to a military hospital in Germany.

A senior Defense official said Bergdahl's "reintegration process" will include "time for him to tell his story, decompress, and to reconnect with his family through telephone calls and video conferences."

Greg Leatherman was a sergeant in Bergdahl's platoon who supervised him but wasn't there the night he disappeared. He said, "I'm pleased to see him returned safely. From experience, I hope that he receives adequate reintegration counseling. I believe that an investigation should take place as soon as health care professionals deem him fit to endure one."

Another senior Defense official said Bergdahl will not likely face any punishment. "Five years is enough," he told CNN on condition of anonymity.

Questions surround the circumstances of Bergdahl's disappearance, and conflicting details have since emerged about how the militants managed to capture him. Published accounts have varied widely, from charges that he walked off the post to claims that he was grabbed from a latrine.

"We really don't know why he left the base and under what circumstances," Pentagon spokesman Rear Adm. John Kirby said Monday. Details of that will come out, he said, adding that the Army has never classified Bergdahl as a deserter and has scheduled the soldier for a promotion next month. But the details around a soldier being taken captive "don't matter," he said, when it comes to the military's response.

"We're going to do all we can to get you back," he said. "That's an obligation that we have, all the people that put on this uniform."

According to firsthand accounts from soldiers in his platoon, Bergdahl, while on guard duty, shed his weapons and walked off the observation post with nothing more than a compass, a knife, water, a digital camera and a diary.

At least six soldiers were killed in subsequent searches for him, according to soldiers involved in the operations to find him. The Pentagon was not able to provide details on specific operations in which any soldiers killed during that time were involved.

Also, many soldiers in Bergdahl's platoon said attacks seemed to increase against the United States in Paktika province in the days and weeks following his disappearance.

"Any of us would have died for him while he was with us, and then for him to just leave us like that, it was a very big betrayal," said former U.S. Army Sgt. Josh Korder, who has the name of three soldiers who died while searching for Bergdahl tatooed on his back.

Many of Bergdahl's fellow troops -- from the seven or so who knew him best in his squad to the larger group that made up the 1st Battalion, 501st Infantry Regiment, 4th Brigade Combat Team, 25th Infantry Division -- told CNN that they signed nondisclosure agreements agreeing to never share any information about Bergdahl's disappearance and the efforts to recapture him. Some were willing to dismiss that document in hopes that the truth would come out about a soldier who they now fear is being hailed as a hero, while the men who lost their lives looking for him are ignored.

"I don't think I could have continued to go on without being able to share with you and the people the true things that happened in this situation," Korder said Monday. "Because if you guys aren't made aware of it, it will just go on, and he'll be a hero, and nobody will be able to know the truth."

Many are flocking to social media, such as the Facebook page "Bowe Bergdahl is NOT a hero," where they share stories detailing their resentment. A number of comments on his battalion's Facebook page prompted the moderator to ask for more respect to be shown.

"I challenge any one of you who label him a traitor to spend 5 years in captivity with the Taliban or Haqqani, then come back and accuse him again. Whatever his intent when he walked away or was captured, he has more than paid for it."

As the chorus of criticism from some in Bergdahl's platoon grows louder, residents in his hometown of Hailey, Idaho, say their support of the soldier hasn't been shaken.

City officials released a statement saying they were being inundated with calls with concerns about Bergdahl's case and calling for people not to judge without knowing all the details.

"We're leaving the politics to everybody else. We're just glad to welcome Bowe back to us," family friend Stefanie O'Neill said. "We're going to let things play out when Bowe is able to tell his story."

Looking for adventure?

E-mails reported by the late Michael Hastings in Rolling Stone in 2012 reveal what Bergdahl's fellow infantrymen learned within days of his disappearance: He told people that he no longer supported the U.S. effort in Afghanistan.

"The future is too good to waste on lies," he wrote to his parents. "And life is way too short to care for the damnation of others, as well as to spend it helping fools with their ideas that are wrong. I have seen their ideas and I am ashamed to even be American. The horror of the self-righteous arrogance that they thrive in. It is all revolting."

Bergdahl wrote to them, "I am sorry for everything. The horror that is America is disgusting."

CNN has not independently verified the authenticity of the e-mails.

Spc. Cody Full, a former member of Bergdahl's squad, tweeted this weekend that before he disappeared, Bergdahl once told him, "If deployment is lame, I'm going to get lost in the Mountains and make my way to China."

Leatherman told CNN that Bergdahl "always looked at the mountains in the distance and talked of 'seeing what's on the other side.' "

Full noted in his Twitter recollections a story that others from Blackfoot Company relay. While soldiers were searching for Bergdahl, a platoon "came upon some children, they asked him have they seen an American. The children said 'yes, he was crawling on his belly through weeds and acting funny a while ago,' " according to Full.

The platoon went to the village where the children said the American had gone. "Villagers said an American did come through the area and was wanting water and someone who spoke English," Full shared.

Korder says he believes Bergdahl was looking for an adventure "without having anybody to answer to" when he left his post.

"He wanted to go see Afghanistan for himself without the Army stopping him or having to tell him what to do," Korder said.

Soldiers died during search

Former Pfc. Jose Baggett, 27, of Chicago, was also in Blackfoot Company and said he was close to two men "killed because of his (Bergdahl's) actions."

"He walked off," Baggett told CNN. "He left his guard post. Nobody knows if he defected or he's a traitor or he was kidnapped. What I do know is, he was there to protect us, and instead he decided to defer from America and go and do his own thing. I don't know why he decided to do that, but we spent so much of our resources, and some of those resources were soldiers' lives."

Many soldiers on the ground at the time said insurgents were able to take advantage of the intense search for Bergdahl.

"A huge thing in-country is not building patterns. Well when you are looking for a person every day that creates a pattern. While searching for him, ambushes and IEDs picked up tremendously. Enemy knew we would be coming. IEDs started being placed more effectively in the coming weeks. Ambushes were more calculated, cover and concealment was used," Full tweeted.

On August 18, 2009, Staff Sgt. Clayton Bowen and Pfc. Morris Walker were killed by an IED in the search for Bergdahl. Staff Sgt. Kurt Curtiss was killed on August 26; 2nd Lt. Darryn Andrews and Pfc. Matthew Michael Martinek were killed after being attacked in Yahya Khail District on September 4; Staff Sgt. Michael Murphrey was killed September 5 by an IED at the Forward Operating Base, Sharana.

Moreover, other operations were put on hold while the search for Bergdahl was made a top priority, according to officers who served in Afghanistan during that time. Manpower and assets -- such as scarce surveillance drones and helicopters -- were redirected to the hunt. The lack of assets is one reason the closure of a dangerous combat outpost, COP Keating, was delayed. Eight soldiers were killed at COP Keating before it was ultimately closed.

One soldier with the 509th Regiment, a sister unit of the 501st, told CNN that after Bergdahl disappeared, the U.S. Army essentially was told to lock down the entire province of Paktika. He described sitting in the middle of a field with his platoon, vulnerable, with capabilities and personnel mismanaged throughout the region. Different platoons ran out of water, food and ammunition.

Two mortarmen -- Pvt. Aaron Fairbairn and Pfc. Justin Casillas -- were killed in a July 4, 2009, attack.

"It was unbelievable," the soldier said. "All because of the selfish act of one person. The amount of animosity (toward him) is nothing like you've ever seen before."

That Bergdahl was freed in an exchange for five detainees at Guantanamo Bay is a further source of consternation.

"I don't understand why we're trading prisoners at Gitmo for somebody who deserted during a time of war, which is an act of treason," Vierkant said.